Practice question
Question
A neutron (1u) at 3×106m/s collides elastically with a deuterium (2u). What fraction of its kinetic energy is retained?
Explanation
Kinetic energy K=½mv² and potential U=mgh per NCERT. Energy conservation K+U=constant for conservative forces. Substituting m, v, h gives 11.1% as energy, matching option A.
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